CN106032949B - Refrigerating device - Google Patents
Refrigerating device Download PDFInfo
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- CN106032949B CN106032949B CN201510102422.4A CN201510102422A CN106032949B CN 106032949 B CN106032949 B CN 106032949B CN 201510102422 A CN201510102422 A CN 201510102422A CN 106032949 B CN106032949 B CN 106032949B
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Abstract
The technical problem of the present invention is to provide a refrigeration device capable of coping with an increase in load of an air conditioning apparatus without replacing the apparatus. In the refrigeration device (1), even when the indoor air conditioning load is increased, the load can be increased without adding a refrigeration device or replacing equipment by connecting the additional unit (60) to the outdoor unit (30) and connecting the second compressor (61) to the existing refrigerant circuit (10), thereby being economical. In addition, the third stop valve (39) and the fourth stop valve (40) for connecting the second compressor (61) and the existing refrigerant circuit (10) are provided, so that the connection is easy and the use is easy.
Description
Technical Field
The present invention relates to a refrigeration apparatus.
Background
Conventionally, when the load of an indoor air conditioner increases, if a margin is not left at the time of initial selection, the capacity becomes insufficient, and it is necessary to add an air conditioner. For example, in an air conditioner disclosed in patent document 1 (japanese patent application laid-open No. 2009-174759), a refrigeration cycle is configured by three modules, i.e., an outdoor module, a compressor module, and an indoor module, and a combination of the three modules is selected so as to have a heat exchange capacity according to a condition.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2009-174759
The above air conditioner is effective in flexibly coping with an increase in load of the indoor air conditioner, but it is only a replacement of the equipment, resulting in an increase in cost.
Disclosure of Invention
The technical problem of the present invention is to provide a refrigeration device capable of coping with an increase in load of an air conditioning apparatus without replacing the apparatus.
A refrigeration apparatus according to a first aspect of the present invention is a refrigeration apparatus in which a refrigerant circuit is configured by a usage unit, a heat source unit, and a communication pipe that connects the usage unit and the heat source unit, and the refrigeration apparatus includes a first compressor, a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, and a control unit. The first compressor compresses a refrigerant circulating in a refrigerant circuit. The first shutoff valve is connected to a first communication pipe through which the liquid refrigerant flows in the communication pipe. The second shutoff valve is connected to a second communication pipe through which the gas refrigerant flows, among the communication pipes. When an extension unit in which a second compressor other than the first compressor is installed is connected to the refrigerant circuit, the third stop valve is connected to the discharge-side pipe of the second compressor. When an additional unit in which a second compressor other than the first compressor is installed is connected to the refrigerant circuit, the fourth shutoff valve is connected to the suction-side pipe of the second compressor. The control section selectively executes a first control mode and a second control mode. The first control mode is a control mode in which only the first compressor is caused to compress the refrigerant in the refrigerant circuit. The second control mode is a control mode in which the first compressor and the second compressor compress the refrigerant in the refrigerant circuit.
In this refrigeration apparatus, even when the load of the indoor air conditioner increases, it is possible to cope with the increase in load without adding a refrigeration apparatus (for example, an air conditioner) or replacing equipment by simply connecting the second compressor to the existing refrigerant circuit, and therefore, it is economical.
A refrigeration apparatus according to a second aspect of the present invention is the refrigeration apparatus according to the first aspect, further comprising a four-way switching valve, a storage tank, a high-pressure-side branch pipe, and a low-pressure-side branch pipe. The four-way switching valve allows the high-pressure refrigerant discharged from the first compressor to flow to the first stop valve or the second stop valve. The accumulator is connected to the suction side of the first compressor and temporarily accumulates the refrigerant. The high-pressure-side branch pipe branches and extends from between the first compressor and the four-way switching valve. The low-pressure-side branch pipe branches and extends from between the accumulator and the suction side of the first compressor. The third shutoff valve is connected to the tip of the high-pressure-side branch pipe, and the fourth shutoff valve is connected to the tip of the low-pressure-side branch pipe.
In this refrigeration apparatus, since the third stop valve and the fourth stop valve for connecting the second compressor to the conventional refrigerant circuit are provided, the connection is easy and the use is easy.
A refrigeration apparatus according to a third aspect of the present invention is the refrigeration apparatus according to the second aspect, further comprising a flow divider. The flow divider is disposed between the storage tank and the suction side of the first compressor. Further, a low-pressure side branch pipe is connected to the flow divider.
In this refrigeration apparatus, the low-pressure-side branch pipe is connected to the flow divider disposed between the accumulator and the suction side of the first compressor, and therefore, the refrigerating machine oil flows from one accumulator in the heat source unit uniformly to the respective suction pipes of the first compressor in the heat source unit and the second compressor in the additional unit.
A refrigeration apparatus according to a fourth aspect of the present invention is the refrigeration apparatus according to any of the first through third aspects, wherein the additional unit includes an oil separator. The oil separator is connected to a discharge-side pipe of the second compressor.
In this refrigeration apparatus, an oil separator does not need to be additionally provided at the rear, and the use is easy.
A refrigeration apparatus according to a fifth aspect of the present invention is the refrigeration apparatus according to any of the first through fourth aspects, wherein the additional unit is connected to the refrigerant circuit via a third shutoff valve and a fourth shutoff valve in a state where oil is sealed but no refrigerant is sealed, and performs vacuum pumping from the discharge side of the second compressor.
In this refrigeration apparatus, in the case of the rotary compressor, the discharge side is separated from the "portion storing the refrigerating machine oil" as compared with the suction side, and therefore, even if the refrigerating machine oil is entrained by the ejection of the moisture dissolved in the refrigerating machine oil during evacuation and is scattered, the suction of the refrigerating machine oil can be avoided. In addition, the additional units can be vacuumized through the third stop valve and the fourth stop valve, and the vacuum pump is easy to use.
In the refrigeration apparatus according to the first aspect of the present invention, even when the load of the indoor air conditioner increases, it is possible to cope with the increase in load without adding a refrigeration apparatus or replacing equipment by simply connecting the second compressor to the existing refrigerant circuit, and therefore, it is economical.
In the refrigeration apparatus according to the second aspect of the present invention, since the third stop valve and the fourth stop valve for connecting the second compressor to the conventional refrigerant circuit are provided, the connection is easy and the use is easy.
In the refrigeration apparatus according to the third aspect of the present invention, the low-pressure-side branch pipe is connected to the flow divider disposed between the accumulator and the intake side of the first compressor, so that the refrigerating machine oil flows from one accumulator in the heat source unit uniformly to the respective intake pipes of the first compressor in the heat source unit and the second compressor in the extension unit.
In the refrigeration apparatus according to the fourth aspect of the present invention, it is not necessary to additionally provide an oil separator at the rear, and the refrigeration apparatus is easy to use.
In the refrigeration apparatus according to the fifth aspect of the present invention, in the case of the rotary compressor, the discharge side is separated from the "portion storing the refrigerating machine oil" as compared with the suction side, and therefore, even if the refrigerating machine oil is entrained by the ejection of the moisture dissolved in the refrigerating machine oil during the evacuation and is scattered, the situation in which the refrigerating machine oil is sucked can be avoided. In addition, the additional units can be vacuumized through the third stop valve and the fourth stop valve, and the vacuum pump is easy to use.
Drawings
Fig. 1 is a refrigerant circuit diagram of a refrigeration apparatus according to an embodiment of the present invention.
Fig. 2 is a block diagram of the control section.
Fig. 3 is a control flowchart of the operation after the additional unit is connected.
Description of the symbols
10 refrigerant circuit
14 liquid side communication piping (first communication piping)
16 gas side communication pipe (second communication pipe)
18 high-pressure side branch control pipe
19 low pressure side branch pipe
20 indoor unit (utilization unit)
30 outdoor unit (Heat source unit)
31 first compressor
32 four-way switching valve
36 storage tank
37 liquid side stop valve (first stop valve)
38 gas side stop valve (second stop valve)
39 third stop valve
40 fourth stop valve
42 diverter
60 extension unit
61 second compressor
611 oil separator
80 control part
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are specific examples of the present invention, and do not limit the technical scope of the present invention.
(1) Structure of refrigerating apparatus 1
Fig. 1 is a circuit diagram of a refrigeration apparatus 1 according to an embodiment of the present invention. The refrigeration apparatus 1 is constituted by an indoor unit 20 and an outdoor unit 30. The refrigeration apparatus 1 is an air conditioner that performs cooling and heating in a building by performing a vapor compression refrigeration cycle operation.
In the refrigeration apparatus 1, the refrigerant circuit 10 is configured by connecting the first compressor 31, the four-way switching valve 32, the outdoor heat exchanger 33, the outdoor expansion valve 34, the indoor heat exchanger 21, the accumulator 36, and the like together by the liquid-side communication pipe 14 and the gas-side communication pipe 16.
During the cooling operation, the four-way switching valve 32 is in a state shown by the solid line in fig. 1, that is, in a state in which the discharge side of the first compressor 31 is connected to the gas side of the outdoor heat exchanger 33 and the suction side of the first compressor 31 is connected to the gas side of the indoor heat exchanger 21 via the accumulator 36. In the cooling operation, the refrigeration apparatus 1 causes the outdoor heat exchanger 33 to function as a radiator and causes the indoor heat exchanger 21 to function as an evaporator.
During the heating operation, the four-way switching valve 32 is in a state shown by a broken line in fig. 1, that is, in a state in which the discharge side of the first compressor 31 is connected to the gas side of the indoor heat exchanger 21 and the suction side of the first compressor 31 is connected to the gas side of the outdoor heat exchanger 33 via the accumulator 36. In the heating operation, the refrigeration apparatus 1 causes the indoor heat exchanger 21 to function as a radiator and causes the outdoor heat exchanger 33 to function as an evaporator.
(1-1) indoor Unit 20
The indoor unit 20 is installed on an indoor wall surface by being hung on a wall surface or the like, or installed on an indoor ceiling of a building or the like by being buried or hung. The indoor unit 20 includes an indoor heat exchanger 21, an indoor expansion valve 22, and an indoor fan 71.
(1-1-1) indoor Heat exchanger 21
The indoor heat exchanger 21 is a cross-fin type fin-and-tube heat exchanger including a heat transfer tube and a plurality of fins. A heat exchanger temperature sensor 211 is installed at an appropriate position of the indoor heat exchanger 21.
In the present embodiment, the indoor heat exchanger 21 is a cross-fin type fin-and-tube heat exchanger, but is not limited thereto, and another type of heat exchanger may be employed.
(1-1-2) indoor expansion valve 22
The indoor expansion valve 22 is an electric expansion valve. The indoor expansion valve 22 is connected to the liquid side of the indoor heat exchanger 21 in order to adjust the flow rate of the refrigerant flowing through the indoor side of the refrigerant circuit 10. The indoor expansion valve 22 can also shut off the flow of the refrigerant.
(1-1-3) indoor Fan 71
The indoor unit 20 has an indoor fan 71. The indoor fan 71 sucks indoor air into the indoor unit 20, causes the indoor air to exchange heat with the refrigerant in the indoor heat exchanger 21, and then supplies the air to the room as supply air. The indoor fan 71 can change the air volume of the air supplied to the indoor heat exchanger 21 within a predetermined air volume range.
(1-2) outdoor Unit 30
The outdoor unit 30 internally houses the first compressor 31, the four-way switching valve 32, the outdoor heat exchanger 33, the outdoor expansion valve 34, the accumulator 36, the supercooling heat exchanger 45, the outdoor fan 73, and the like. The outdoor unit 30 also houses a branch circuit 46 that passes through the supercooling heat exchanger 45.
(1-2-1) first compressor 31
The first compressor 31 is a variable displacement compressor, and the rotational speed of the motor is controlled by an inverter.
(1-2-2) four-way switching valve 32
The four-way switching valve 32 is a valve that switches the flow direction of the refrigerant. During the cooling operation, the four-way switching valve 32 connects the discharge side of the first compressor 31 to the gas side of the outdoor heat exchanger 33, and connects the suction side of the first compressor 31 (specifically, the accumulator 36) to the gas-side communication pipe 16 side (cooling operation state: see the solid line of the four-way switching valve 32 in fig. 1). As a result, the outdoor heat exchanger 33 functions as a condenser of the refrigerant, and the indoor heat exchanger 21 functions as an evaporator of the refrigerant.
During the heating operation, the four-way switching valve 32 connects the discharge side of the first compressor 31 to the gas side communication pipe 16 and connects the suction side of the first compressor 31 to the gas side of the outdoor heat exchanger 33 (heating operation state: see the broken line of the four-way switching valve 32 in fig. 1). As a result, the indoor heat exchanger 21 functions as a condenser of the refrigerant, and the outdoor heat exchanger 33 functions as an evaporator of the refrigerant.
(1-2-3) outdoor Heat exchanger 33
The outdoor heat exchanger 33 is a cross-fin type finned tube heat exchanger. However, the present invention is not limited to this, and other types of heat exchangers may be used.
The gas side of the outdoor heat exchanger 33 is connected to the four-way switching valve 32, and the liquid side of the outdoor heat exchanger 33 is connected to the outdoor expansion valve 34.
(1-2-4) outdoor expansion valve 34
The outdoor expansion valve 34 is an electrically driven expansion valve that adjusts the pressure, flow rate, and the like of the refrigerant flowing outside the outdoor side of the refrigerant circuit 10. The outdoor expansion valve 34 is disposed downstream of the outdoor heat exchanger 33 in the refrigerant flow direction in the refrigerant circuit 10 during the cooling operation.
During the cooling operation, the opening degree of the outdoor expansion valve 34 is fully opened. On the other hand, during the heating operation, the opening degree of the outdoor expansion valve 34 is adjusted so as to reduce the pressure of the refrigerant flowing into the outdoor heat exchanger 33 to a pressure at which the refrigerant can be evaporated in the outdoor heat exchanger 33 (i.e., an evaporation pressure).
(1-2-5) storage tank 36
The accumulator 36 separates liquid refrigerant from gaseous refrigerant. The receiver 36 is connected to a suction return pipe 361, and the suction return pipe 361 allows the refrigerant to be drawn out from the receiver 36 and returned to the suction side of the first compressor 31. The intake return pipe 361 is provided with an intake return opening/closing valve 362. The adsorption return on-off valve 362 is an electromagnetic valve.
(1-2-6) supercooling heat exchanger 45
The supercooling heat exchanger 45 is a heat exchanger that exchanges heat between the refrigerant cooled in the outdoor heat exchanger 33 or the indoor heat exchanger 21 and the refrigerant flowing through the branch circuit 46, and has a flow path through which two paths of refrigerants flow in an opposing manner. A branch-side expansion valve 47 is provided at a position upstream of the branch circuit 46, which is the supercooling heat exchanger 45.
(1-2-7) outdoor fan 73
The outdoor fan 73 sends the sucked outdoor air to the outdoor heat exchanger 33 and causes the air to exchange heat with the refrigerant. The outdoor fan 73 can change the air volume when supplied to the outdoor heat exchanger 33. The outdoor fan 73 is a propeller or the like, and is driven by a motor configured by a dc fan motor or the like.
(1-2-8) liquid side shutoff valve 37
The liquid-side shutoff valve 37 is disposed on the downstream side of the outdoor heat exchanger 34 and on the upstream side of the liquid-side communication pipe 14 in the refrigerant circuit 10 in the flow direction of the refrigerant during the cooling operation.
(1-2-9) gas side shutoff valve 38
The gas-side shutoff valve 38 is disposed on the downstream side of the gas-side communication pipe 16 and on the upstream side of the four-way switching valve 32 in the refrigerant flow direction in the refrigerant circuit 10 during the cooling operation.
(1-2-10) third stop valve 39
The third stop valve 39 is connected to the tip of the high-pressure-side branch pipe 18 that branches and extends from between the first compressor 31 and the four-way switching valve 32. The third stop valve 39 is closed at a time other than when connected to the extension unit 60.
(1-2-11) fourth stop valve 40
The fourth stop valve 40 is connected to a tip of a low-pressure-side branch pipe 19 that branches and extends from between the accumulator 36 and the suction side of the first compressor 31. The fourth stop valve 40 is closed at a time other than when connected to the extension unit 60.
(1-2-12) shunt 42
The flow divider 42 is disposed between the storage tank 36 and the suction side of the first compressor 31. The low-pressure-side branch pipe 19 is connected to the flow divider 42.
(1-2-13) control section 80
Fig. 2 is a block diagram of the control unit 80. In fig. 2, the controller 80 includes an outdoor controller 801 and an indoor controller 803.
The outdoor side controller 801 is disposed in the outdoor unit 30, and controls the operation of each device. The indoor-side control unit 803 is disposed in the indoor unit 20 and controls the indoor expansion valve 22 and the like. The outdoor control unit 801 and the indoor control unit 803 each have a microcomputer, a memory, and the like, and can exchange control signals and the like with each other.
The outdoor side controller 801 is provided with a terminal connection portion 801a to which the wire harness from the extension unit 60 is connected.
(1-3) extension Unit 60
The extension unit 60 is an extension circuit to which the second compressor 61, the oil separator 611, the capillary tube 612, and the check valve 613 are connected. Is a circuit for connecting the second compressor to the existing refrigerant circuit in the case where the load of the indoor air conditioner increases.
The extension unit 60 is connected to the refrigerant circuit 10 of the refrigeration apparatus 1 by a discharge-side pipe 63 and a suction-side pipe 65, the discharge-side pipe 63 being connected to the third shutoff valve 39 of the outdoor unit 30, and the suction-side pipe 65 being connected to the fourth shutoff valve 40 of the outdoor unit 30.
(1-3-1) second compressor 61
The second compressor 61 is a variable displacement compressor, and the rotational speed of the motor is controlled by an inverter. The second compressor 61 is not necessarily a variable displacement compressor, and may be a fixed displacement compressor.
(1-3-2) oil separator 611
The oil separator 611 is connected to the discharge-side pipe 63, and separates the refrigerating machine oil from the refrigerant discharged from the second compressor 61.
(1-3-3) capillary tube 612
The capillary tube 612 is connected to a pipe for returning the refrigerating machine oil separated in the oil separator 611 to the second compressor 61, and depressurizes the high-pressure refrigerating machine oil and returns the oil to the second compressor 61.
(1-3-4) check valve 613
The check valve 613 is connected to the discharge-side pipe 63 at a position downstream of the oil separator 611, and allows the refrigerant to flow only from the oil separator 611 to the third shut-off valve 39.
(2) Operation of the refrigeration apparatus 1
(2-1) Cooling operation
During the cooling operation, the four-way switching valve 32 is in the state shown by the solid line in fig. 1. In this refrigerant circuit, when the first compressor 31, the outdoor fan 73, and the indoor fan 71 are operated, the low-pressure gas refrigerant is compressed by the first compressor 31 to become a high-pressure gas refrigerant.
The high-pressure gas refrigerant is sent to the outdoor heat exchanger 33 via the oil separator 311, the check valve 313, and the four-way switching valve 32. Then, the high-pressure gas refrigerant exchanges heat with the outdoor air supplied by the outdoor fan 73 in the outdoor heat exchanger 33 to dissipate heat.
The high-pressure refrigerant cooled in the outdoor heat exchanger 33 flows through the outdoor expansion valve 34 in the fully open state to the supercooling heat exchanger 45. A part of the refrigerant flowing through the supercooling heat exchanger 45 flows into the branch circuit 46, is decompressed by the branch-side expansion valve 47, and then enters the supercooling heat exchanger 45. Therefore, the refrigerant cooled in the outdoor heat exchanger 33 is further cooled by heat exchange with the refrigerant flowing through the branch circuit 46 in the supercooling heat exchanger 45.
The refrigerant flowing out of the supercooling heat exchanger 45 is sent to the indoor expansion valve 22 through the liquid-side shutoff valve 37 and the liquid-side communication pipe 14, and is decompressed by the indoor expansion valve 22 to become a low-pressure refrigerant in a gas-liquid two-phase state. The low-pressure gas-liquid two-phase refrigerant is sent to the indoor heat exchanger 21, exchanges heat with the indoor air supplied by the indoor fan 71 in the indoor heat exchanger 21, evaporates, and becomes a low-pressure gas refrigerant.
The low-pressure gas refrigerant enters the accumulator 36 through the gas-side communication pipe 16, the gas-side shutoff valve 38, and the four-way switching valve 32. In addition, the refrigerant from the branch circuit 46 also enters the accumulator 36.
The low-pressure refrigerant flowing out of the accumulator 36 and the oil separated in the oil separator 311 and depressurized in the capillary tube 312 join together in the middle of flowing to the suction side of the first compressor 31, and are sucked into the first compressor 31. Thus, the cooling operation is performed.
(2-2) heating operation
During the heating operation, the four-way switching valve 32 is in a state shown by a broken line in fig. 1. In this refrigerant circuit, when the first compressor 31, the outdoor fan 73, and the indoor fan 71 are operated, the low-pressure gas refrigerant is compressed by the first compressor 31 to become a high-pressure gas refrigerant.
The high-pressure gas refrigerant is sent to the indoor heat exchanger 21 through the oil separator 311, the check valve 313, and the four-way switching valve 32. Then, the high-pressure gas refrigerant exchanges heat with the indoor air supplied by the indoor fan 71 in the indoor heat exchanger 21 to dissipate the heat.
The high-pressure refrigerant cooled in the indoor heat exchanger 21 flows from the indoor heat exchanger 21 to the supercooling heat exchanger 45 through the fully opened indoor expansion valve 22, the liquid-side communication pipe 14, and the liquid-side shutoff valve 37.
Among the refrigerants that have entered the supercooling heat exchanger 45, a part of the refrigerant that has first passed through the supercooling heat exchanger 45 flows into the branch circuit 46, is reduced in pressure in the branch-side expansion valve 47, and then enters the supercooling heat exchanger 45, and therefore, the refrigerant that has been cooled in the indoor heat exchanger 21 exchanges heat with the refrigerant that has flowed through the branch circuit 46 in the supercooling heat exchanger 45, and is further cooled.
The refrigerant flowing out of the supercooling heat exchanger 45 is sent to the outdoor expansion valve 34, and is decompressed by the outdoor expansion valve 34 to become a low-pressure refrigerant in a gas-liquid two-phase state. The low-pressure gas-liquid two-phase refrigerant is sent to the outdoor heat exchanger 33, exchanges heat with outdoor air supplied by the outdoor fan 73 in the outdoor heat exchanger 33, evaporates, and becomes a low-pressure gas refrigerant.
The low-pressure gas refrigerant enters the accumulator 36 through the four-way switching valve 32. In addition, the refrigerant from the branch circuit 46 also enters the accumulator 36.
The low-pressure refrigerant flowing out of the accumulator 36 and the oil separated in the oil separator 311 and depressurized in the capillary tube 312 join together in the middle of flowing to the suction side of the first compressor 31, and are sucked into the first compressor 31. Thus, the heating operation is performed.
(2-3) operation in connecting extension Unit 60
The cooling operation and the heating operation described in the above are operations in a state where the additional unit 60 is not connected to the refrigerant circuit 10 in fig. 1. However, when the conventional air conditioner has no margin or shortage with respect to the indoor air conditioning load, the discharge-side pipe 63 of the extension unit 60 is connected to the third stop valve 39, the suction-side pipe 65 is connected to the fourth stop valve 40, and the circuit of the extension unit 60 is added to the refrigerant circuit 10. Hereinafter, the operation when the extension unit 60 is connected will be described with reference to the control flow.
Fig. 3 is a control flowchart of the operation after the extension unit 60 is connected. In fig. 3, in step S1, the control unit 80 determines whether or not there is an operation command. Since it is necessary for the user to determine whether or not the cooling operation or the heating operation is actually performed, the user issues an operation command via a predetermined input unit of the remote controller.
Next, the control unit 80 determines whether or not there is an extension unit connection signal in step S2. When the extension unit 60 is connected to the outdoor unit 30 and the harness of the extension unit 60 is connected to the terminal connection portion 801a of the outdoor side controller 801, the inter-terminal resistance of the terminal connected to the second compressor 61 in the interior thereof changes, and therefore the change becomes a signal indicating the connection of the extension unit 60, and the controller 80 determines that the extension unit 60 is connected via the outdoor side controller 801.
If the control unit 80 determines that the extension unit connection signal is present, the process proceeds to step S3. On the other hand, if the control unit 80 does not determine that the extension unit connection signal is present, the process proceeds to step S31, and the first compressor 31 alone is operated to perform the cooling operation or the heating operation.
Next, in step S3, the controller 80 operates the first compressor 31 and the second compressor 61, and starts the cooling operation or the heating operation. The operation of the cooling operation and the heating operation of the refrigeration apparatus 1 after the extension unit 60 is connected is basically the same as the operation of the cooling operation and the heating operation, but the flow of the refrigerant after the accumulator 36 is different from that before the extension unit 60 is connected.
That is, the refrigerant flowing from the accumulator 36 to the first compressor 31 is substantially equally split by the flow splitter 42 into the refrigerant flowing to the first compressor 31 and the refrigerant flowing to the second compressor 61, and flows to the compressors. Since the refrigerating machine oil is contained in the refrigerant, the refrigerating machine oil is also equally divided as a result.
The subsequent flow of the refrigerant to the first compressor 31 is the same as that described in the cooling operation (2-1) and the heating operation (2-2).
On the other hand, the refrigerant flowing through the second compressor 61 is sucked into the second compressor 61 from the fourth stop valve 40 through the suction-side pipe 65 and compressed. The high-pressure gas refrigerant discharged from the second compressor 61 is separated from the refrigerating machine oil in the oil separator 611 while flowing to the third stop valve 39 through the discharge-side pipe 63. The refrigerating machine oil separated in the oil separator 611 is decompressed in the capillary tube 612, merges with the refrigerant flowing through the suction-side pipe 65, and is again sucked into the second compressor 61.
The high-pressure gas refrigerant flowing through the oil separator 611 enters the high-pressure side branch pipe 18 of the outdoor unit 30 from the third shut-off valve 39, merges with the high-pressure gas refrigerant from the first compressor 31 at the end of the high-pressure side branch pipe 18, and flows to the four-way switching valve 32. The subsequent flow is the same as described in the cooling operation (2-1) and the heating operation (2-2).
The controller 80 determines whether or not an operation stop command is issued in step S4, and when an operation stop command is issued, the operation is stopped in step S5.
As described above, the extension unit 60 including the second compressor 61 is connected to the refrigerant circuit 10 via the third stop valve 39 and the fourth stop valve 40 provided in the outdoor unit 30, whereby the circuit of the extension unit 60 is added.
Further, by connecting the harness of the extension unit 60 to the terminal connection 801a of the outdoor side controller 801, the second compressor 61 is under the management of the controller 80, and normal cooling operation and heating operation can be performed.
(3) Feature(s)
(3－1)
In the refrigeration apparatus 1, even when the indoor air conditioning load increases, it is possible to cope with the increase in load without adding a refrigeration apparatus or replacing equipment by connecting the extension unit 60 to the outdoor unit 30 and connecting the second compressor 61 to the conventional refrigerant circuit 10.
(3－2)
The refrigeration apparatus 1 is provided with the third stop valve 39 and the fourth stop valve 40 for connecting the second compressor 61 to the conventional refrigerant circuit 10, and therefore, is easy to connect and use.
(3－3)
In the refrigeration apparatus 1, the low-pressure side branch pipe 19 is connected to the flow divider 42 disposed between the accumulator 36 and the suction side of the first compressor 31, and therefore, the refrigerating machine oil flows from the one accumulator 36 in the outdoor unit 30 uniformly to the respective suction pipes of the first compressor 31 in the outdoor unit 30 and the second compressor 61 in the extension unit 60.
(3－4)
The refrigeration apparatus 1 does not need to additionally provide an oil separator 611, and is easy to use.
(4) Others
In the refrigeration apparatus 1, the additional unit 60 is connected to the refrigerant circuit 10 via the third stop valve 39 and the fourth stop valve 40 in a state in which oil is sealed but refrigerant is not sealed, and performs vacuum pumping from the discharge side of the second compressor 61.
For example, in the case of the rotary compressor, the discharge side is separated from the "portion storing the refrigerating machine oil" as compared with the suction side, and therefore, even if the refrigerating machine oil is entrained by the ejection of the moisture dissolved in the refrigerating machine oil during the evacuation and is scattered, the suction of the refrigerating machine oil can be avoided.
Further, the pipes and the like in the extension unit 60 can be evacuated by the third stop valve 39 and the fourth stop valve 40, and thus the use is easy.
Industrial applicability of the invention
According to the present invention, the load can be increased by additionally providing the extension unit to the outdoor unit, and thus the present invention can be widely applied to air conditioners.
Claims (6)
1. A refrigeration device (1) is provided with a refrigerant circuit (10) that is configured from a usage unit (20), a heat source unit (30), and communication pipes (14, 16), wherein the communication pipes (14, 16) connect the usage unit (20) and the heat source unit (30),
the refrigeration device (1) is characterized by comprising:
a first compressor (31), the first compressor (31) compressing the refrigerant circulating in the refrigerant circuit (10);
a first shutoff valve (37), the first shutoff valve (37) being connected to a first communication pipe (14) in the communication pipe through which the liquid refrigerant flows;
a second shutoff valve (38), the second shutoff valve (38) being connected to a second communication pipe (16) of the communication pipes through which the gas refrigerant flows;
a third stop valve (39), wherein the third stop valve (39) is connected to a discharge-side pipe (63) of the second compressor (61) when an additional unit (60) in which the second compressor (61) other than the first compressor (31) is installed is connected to the refrigerant circuit (10);
a fourth stop valve (40), wherein when an additional unit (60) provided with a second compressor (61) other than the first compressor (31) is connected to the refrigerant circuit (10), the fourth stop valve (40) is connected to a suction-side pipe (65) of the second compressor (61); and
a control unit (80) that selectively executes a first control mode and a second control mode, the first control mode being a control mode in which only the first compressor (31) is caused to compress the refrigerant in the refrigerant circuit (10), the second control mode being a control mode in which the first compressor (31) and the second compressor (61) are caused to compress the refrigerant in the refrigerant circuit (10),
the control unit (80) has a terminal connection unit (801a) for electrically connecting to the extension unit (60),
the control unit (80) determines whether or not the extension unit (60) is connected.
2. A cold appliance (1) according to claim 1, further comprising:
a four-way switching valve (32), wherein the four-way switching valve (32) allows the high-pressure refrigerant discharged from the first compressor (31) to flow to the first stop valve (37) or the second stop valve (38);
an accumulator (36), the accumulator (36) being connected to the suction side of the first compressor (31) and temporarily accumulating refrigerant;
a high-pressure-side branch pipe (18), the high-pressure-side branch pipe (18) branching and extending from between the first compressor (31) and the four-way switching valve (32); and
a low-pressure side branch pipe (19), the low-pressure side branch pipe (19) branching and extending from between the accumulator (36) and the suction side of the first compressor (31),
the third stop valve (39) is connected to the tip of the high-pressure-side branch pipe (18), and the fourth stop valve (40) is connected to the tip of the low-pressure-side branch pipe (19).
3. A cold appliance (1) according to claim 2,
the refrigeration device (1) further comprising a flow divider (42), the flow divider (42) being arranged between the storage tank (36) and the suction side of the first compressor (31),
the low-pressure-side branch pipe (19) is connected to the flow divider (42).
4. A cold appliance (1) according to any of the claims 1 to 3,
the extension unit (60) has an oil separator (611), and the oil separator (611) is connected to the discharge-side pipe (63) of the second compressor (61).
5. A cold appliance (1) according to any of the claims 1 to 3,
the additional unit (60) is connected to the refrigerant circuit (10) via the third stop valve (39) and the fourth stop valve (40) in a state in which oil is sealed but refrigerant is not sealed, and evacuates the refrigerant from the discharge side of the second compressor (61).
6. A cold appliance (1) according to claim 4,
the additional unit (60) is connected to the refrigerant circuit (10) via the third stop valve (39) and the fourth stop valve (40) in a state in which oil is sealed but refrigerant is not sealed, and evacuates the refrigerant from the discharge side of the second compressor (61).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510102422.4A CN106032949B (en) | 2015-03-09 | 2015-03-09 | Refrigerating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510102422.4A CN106032949B (en) | 2015-03-09 | 2015-03-09 | Refrigerating device |
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| Publication Number | Publication Date |
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| CN106032949A CN106032949A (en) | 2016-10-19 |
| CN106032949B true CN106032949B (en) | 2020-01-10 |
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| CN201510102422.4A Active CN106032949B (en) | 2015-03-09 | 2015-03-09 | Refrigerating device |
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| Country | Link |
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| CN (1) | CN106032949B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0411172A1 (en) * | 1989-07-31 | 1991-02-06 | KKW Kulmbacher Klimageräte-Werk GmbH | Refrigeration device for a plurality of coolant circuits |
| CN101135475A (en) * | 2006-09-01 | 2008-03-05 | Lg电子株式会社 | Water-cooled air conditioner |
| CN102418959A (en) * | 2010-09-27 | 2012-04-18 | Lg电子株式会社 | Refigerant system and a control method the same |
-
2015
- 2015-03-09 CN CN201510102422.4A patent/CN106032949B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0411172A1 (en) * | 1989-07-31 | 1991-02-06 | KKW Kulmbacher Klimageräte-Werk GmbH | Refrigeration device for a plurality of coolant circuits |
| CN101135475A (en) * | 2006-09-01 | 2008-03-05 | Lg电子株式会社 | Water-cooled air conditioner |
| CN102418959A (en) * | 2010-09-27 | 2012-04-18 | Lg电子株式会社 | Refigerant system and a control method the same |
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| Publication number | Publication date |
|---|---|
| CN106032949A (en) | 2016-10-19 |
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